pytest-structlog
Structured logging assertions
Decision gist · record as of 2026-08-14
Yes. Low install friction, active maintenance, no known vulnerabilities, and MIT licensing make it a safe choice. If your test suite uses structlog for structured logging, this fixture is the standard way to assert on log output in pytest—it directly addresses a gap in testing structured logs that would otherwise require manual mocking or post-test log file inspection.AI-flagged interpretation of the facts on this page — verify before relying
Before you install
- Requires Python 3.8 or later; structlog must be configured in the code under test.
- Low friction: pure Python wheel with only pytest and structlog as runtime dependencies.
- Actively maintained with a recent release (338 days ago) and an active repository.
License · maintenance · safety
MIT (permissive) — MIT license permits use in proprietary and open-source projects with minimal restrictions; attribution required.
last release 2025-09-10 (338 days) · last repo commit 2026-08-01 · 67 stars
0 known vulnerabilities (OSV.dev, 2026-08-14) · 286,541 downloads/mo, #8,041 on PyPI
Alternatives
Verify before relying
pip install pytest-structlog
# In your test file:
from pytest_structlog import StructuredLogCapture
def test_logging(log: StructuredLogCapture):
# Your code that logs via structlog
assert log.has("event message")
assert len(log.events) == 1- Whether the fixture automatically captures all structlog output or requires explicit configuration in code under test.
- Performance impact when capturing large numbers of log events in a single test.
What it is and what it does
pytest-structlog is a pytest plugin that integrates with structlog to capture and inspect structured log events during testing. It provides a `log` fixture that exposes captured events as a list and offers helper methods like `log.has()` for asserting that specific log messages with particular context were emitted. The fixture automatically configures structlog for testing purposes, stripping away production processors and replacing them with a test-friendly list-based collector.
The package lets you verify not just that logging occurred, but exactly what was logged—including event messages, log levels, and arbitrary context fields. You can assert on individual events, compare sequences of events, count occurrences, and use flexible matching patterns. It also provides command-line options and configuration file support to customize which structlog processors are kept or removed during testing, allowing you to preserve custom processors when needed.
Use it for
- Verify that your application logs the correct messages and context when specific code paths execute.
- Assert that errors or warnings are logged with the expected fields and severity levels during exception handling.
- Test that batch operations log the right number of events and include required tracking or debugging information.
- Validate that custom structlog processors are invoked correctly by inspecting the final event dictionaries.
- Ensure sensitive information is not accidentally logged by checking event contents in security-focused tests.
Worth the install?
AI-flagged interpretation of the facts on this page. Verify before relying on it.
Yes.
Low install friction, active maintenance, no known vulnerabilities, and MIT licensing make it a safe choice. If your test suite uses structlog for structured logging, this fixture is the standard way to assert on log output in pytest—it directly addresses a gap in testing structured logs that would otherwise require manual mocking or post-test log file inspection.
Install
pytest-structlog on PyPI
Before you install
Low friction: pure Python wheel with only pytest and structlog as runtime dependencies. Actively maintained with a recent release (338 days ago) and an active repository.
Requires Python 3.8 or later; structlog must be configured in the code under test.
License in practice
MIT license permits use in proprietary and open-source projects with minimal restrictions; attribution required.
Quickstart
pip install pytest-structlog
# In your test file:
from pytest_structlog import StructuredLogCapture
def test_logging(log: StructuredLogCapture):
# Your code that logs via structlog
assert log.has("event message")
assert len(log.events) == 1Verify before relying
- Whether the fixture automatically captures all structlog output or requires explicit configuration in code under test.
- Performance impact when capturing large numbers of log events in a single test.
Package facts
| License | MIT permissive |
| Python support | Supports the current Python release >=3.8 |
| Install friction | Low. Pure-Python wheel |
| Runtime dependencies | 2 packagespyteststructlog |
| Maintenance | Actively maintained 338 days since the last release |
| Last repo commit | |
| First released | |
| Downloads | 286,541 / month, #8,041 on PyPI 30-day window, as of 2026-08-14 |
| Known vulnerabilities | None known OSV.dev, checked 2026-08-14 |
| Classifiers | Framework :: PytestProgramming Language :: PythonProgramming Language :: Python :: 3 |
Evidence: pytest_structlog-1.2-py3-none-any.whl
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See also structlog-gcp · structlog-sentry · opentelemetry-instrumentation-structlog · structlog · django-structlog · macwinnie-enhanced-logging · structlog-pretty · pytest-harvest · pytest-loguru · pytest-assume